I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
coleader colder collider colluder golder colter clatter caldera gladier clowder coulter gladder clattery cloudier collator cloddier glider clouter clutter gloater guilder caldaria cluttery gleetier killdeer gauleiter kelter kilter
leader pleader coleader shielder welder reloader bladder leadier lewder lieder ladder loader lader gladier alder blader lauder balladeer fielder gladder melder bleater balder pleater bleeder sledder elder wielder gelder yielder
colead cleat coaled coiled coled collate collet cooled cowled